[mlview-list][Patch] Multiple trees support in MlViewTreeView

[Nicolas Centa <nicolas centa free fr>]

Hello !

This patch adds support for multiple trees in MlViewTreeView. 

ŤAPIť changes in MlViewTreeView :
- The trees (currently MlViewTreeEditor2 only) are in a GtkNotebook
(MlViewTreeViewPrivate::trees)
- The current tree is pointed by MlViewTreeViewPrivate::tree_editor
- Look at mlview_tree_view_construct() : you can add a tree simply by adding it
to the notebook (connections etc. are made automatically for all trees which are
in it)

A bug was also corrected in MlViewNodeEditor (comment node editor) (see
mlview_node_editor_clear_xml_text_node_view(), mlview-node-editor.c line 968).

I will soon add a tree with icons, etc. like I wanted to do :-) 

Don't forget to give me your opinions, especially if you are an user :-)

Nicolas Centa
"HappyPeng"

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